Robustness in the l/sup 1/-based design methodology

The authors are concerned with obtaining necessary and sufficient conditions for robustly stabilizing a class of plants characterized by a known linear-shift-invariant plant with additive perturbations of the form of possibly nonlinear, time-varying l/sup 1/-stable operators. The authors show that, in some sense, the small gain theorem is necessary and sufficient even when the perturbations are restricted to a class of linear operators.<
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